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Post by Jeff Ledger on May 16, 2007 23:50:51 GMT -5
Shadow (Glenn H.) sent me some pics of his 2nd sid cart. It looks like any easy beginner project for a few of us Eagle newbies here. I've asked him to take a few more shots of the unit without the SID installed so that it can be replicated. Here are a couple of the best photos I have so far. If we put more than one head on this, perhaps we can avoid PCB errors and waste. www.flickr.com/photos/8405497@N08/Anyone want to collaborate on this? Jeff
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Post by Leif Bloomquist on May 17, 2007 7:29:32 GMT -5
Is there any facility for setting the second SID's base address?
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Post by 65coupei6 on May 17, 2007 17:28:18 GMT -5
Is the top left part a diode bridge?
I havn't done anything really with electronics since high school. The section of the forum is making me want to start messing around again.
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Post by Jim Brain on May 19, 2007 22:23:05 GMT -5
Before you start on this, someone should compare to a SID Symphony cart
Also, as for setting base address, I highly recommend doing what I did on the Link232 using a 74LS138. It gives you an easy way to map 3 additional address lines into 1 of 8 base addresses, which means you could use that and then chain 7 of the carts off the 64.
Jim
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Post by Leif Bloomquist on May 22, 2007 9:08:26 GMT -5
Now that would be cool, having several of these run off a cart expander simultaneously 8)
Mostly, I just want a way to easily switch between $d420 (where a lot of stereo SIDS live) and $de00 (where Prophet64 expects to see the SID2SID stereo sid board).
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Post by Jim Brain on May 23, 2007 20:29:28 GMT -5
I think I'd decode d4XX somehow and then make a 3 way jumper:
IO1 IO2 D4XX
and feed it into a 2-4 decoder.
That way, you could do it all.
Jim
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